The present disclosure provides a coherent light receiving optical device. It includes: an optical switch group, each optical switch thereof is configured to switch between two different preset bands and output two signal lights or two oscillation lights corresponding to the two different preset bands; a 1×2 power beam splitter group, each 1×2 power beam splitter thereof is configured to split one of the two oscillation lights into two split oscillation lights; an optical hybrid group, each optical hybrid thereof is configured to mix the one split oscillation light from an oscillation path with one signal light from a signal path in the same preset band, to output a mixed light; a detector group, each detector thereof is configured to convert the mixed lights of two different preset bands in the mixed lights into photocurrent in the same detector, so as to multiplex the detector.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A coherent light receiving optical device, wherein the coherent light receiving optical device comprises: an optical switch group in a signal path, the optical switch group comprises three optical switches, wherein a first signal light is outputted as a first band signal light and a second band signal light of the first signal light after passing through a first optical switch of the three optical switches, a second signal light is outputted as a first band signal light and a second band signal light of the second signal light after passing through a second optical switch of the three optical switches; and a third optical switch of the three optical switches is configured to output as a first band oscillation light and a second band oscillation light after an oscillation light passes through it; a 1×2 power beam splitter group in an oscillation path, the 1×2 power beam splitter group comprises two 1×2 power beam splitters, one of which splits the first band oscillation light outputted by the third optical switch into two first band split oscillation lights and the other of which splits the second band oscillation light outputted by the third optical switch into two second band split oscillation lights; an optical hybrid group, the optical hybrid group comprises two first band optical hybrids and two second band optical hybrids, wherein each of the two first band optical hybrids is configured to mix each of the said two first band split oscillation lights from the oscillation path with a corresponding one of said first band signal lights of the first signal light and said first band signal light of the second signal light from the signal path and then output a first band mixed light, and each of the two second band optical hybrids is configured to mix each of the two second band split oscillation lights from the oscillation path with a corresponding one of said second band signal lights of the first signal light and said second band signal light of the second signal light from the signal path and then output a second band mixed light; a detector group, each detector of the detector group is used to convert the first band mixed light and the second band mixed light into the photocurrent in the same detector so as to multiplex the detector.
2. The coherent light receiving optical device as claimed in claim 1, characterized in that, the coherent light receiving optical device further comprises a polarization rotation beam splitter which is disposed upstream of the optical switch of the three optical switches which are arranged in the signal path, the polarization rotation beam splitter is configured to split one of the two signal lights into a first polarization rotation signal light and a second polarization rotation signal light and they enter the optical switch; or a polarization rotation beam splitter or a combination of a polarization beam splitter and a polarization rotator is disposed outside the coherent light receiving optical device, which is configured to split one of the two signal lights into a first polarization rotation signal light and a second polarization rotation signal light, and they respectively enter the optical switches of the coherent light receiving optical device which are arranged in the signal path.
3. The coherent light receiving optical device as claimed in claim 2, characterized in that, the coherent light receiving optical device further comprises at least one adjustable optical attenuator, which is disposed in an light path comprising the optical switch and is located behind the optical switch; or the coherent optical receiving optical device further comprises at least one adjustable optical attenuator disposed outside the coherent light receiving optical device, wherein at least one of the first signal light, the second signal light and the oscillation light passes through the at least one adjustable optical attenuator and enters the coherent light receiving optical device.
4. The coherent light receiving optical device as claimed in claim 3, characterized in that, the coherent light receiving optical device further comprises at least one light splitter, which is disposed adjacent to the at least one adjustable optical attenuator in the corresponding light path and located upstream or downstream of the at least one adjustable optical attenuator.
5. The coherent light receiving optical device as claimed in claim 4, characterized in that, the coherent light receiving optical device further comprises at least one power monitoring detector which is disposed downstream of each light splitter of the at least one light splitter in the light path, and a portion of the split light by the corresponding light splitter enters one of the at least one power monitoring detector or into at least two of the at least one power monitoring detector which are connected in series.
6. The coherent light receiving optical device as claimed in claim 1, characterized in that, the coherent light receiving optical device further comprises one heating resistor which makes temperature of each detector maintain above a predetermined temperature.
7. The coherent light receiving optical device as claimed in claim 1, characterized in that, the detector group comprises 8 high speed detectors; the optical hybrid group comprises at least two 90° optical hybrid.
8. The coherent light receiving optical device as claimed in claim 1, characterized in that, the coherent optical receiving optical device further comprises at least one coupler, wherein at least one of the first signal light, the second signal light and the oscillation light enters the corresponding one of the signal path and the oscillation path after passing through the at least one coupler.
9. The coherent light receiving optical device as claimed in claim 1, characterized in that, the coherent light receiving optical device further comprises at least one 2×2 power beam splitter, wherein the at least one 2×2 power beam splitter is arranged behind the optical hybrid group; the 2×2 power beam splitter is provided with two input ends, with one input end connected to the first band mixed light outputted from the first band optical hybrid of the signal path, and the other input end connected to the second band mixed light outputted from the second band optical hybrid of the oscillation path; the 2×2 power beam splitter is provided with two output ends, both of which are connected to the same detector simultaneously.
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August 5, 2024
June 17, 2025
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